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Stockholders' Equity - Preferred Stock (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Stockholders' Equity          
Preferred Stock dividend declared $ 1.0 $ 1.0 $ 2.0 $ 2.0  
Series A convertible preferred stock          
Stockholders' Equity          
Preferred stock par value $ 0.001   $ 0.001   $ 0.001